CN106636590A - Medium carbon steel thermal mechanical treatment method capable of replacing quenching and tempering treatment - Google Patents
Medium carbon steel thermal mechanical treatment method capable of replacing quenching and tempering treatment Download PDFInfo
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- CN106636590A CN106636590A CN201611094718.7A CN201611094718A CN106636590A CN 106636590 A CN106636590 A CN 106636590A CN 201611094718 A CN201611094718 A CN 201611094718A CN 106636590 A CN106636590 A CN 106636590A
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- Prior art keywords
- carbon steel
- medium carbon
- quenching
- rolling
- tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
Abstract
The invention relates to a medium carbon steel thermal mechanical treatment method capable of replacing quenching and tempering treatment. The medium carbon steel thermal mechanical treatment method mainly comprises the following steps: heating a medium carbon steel round bar to an alpha+gamma two-phase region for heat insulation for a period of time and performing groove rolling for nine times after discharge out of a furnace, wherein the cumulative deformation is 70 percent; performing furnace heating for five minutes after the completion of rolling for three times and cooling air to a room temperature after rolling for nine times. The steel bar microstructure obtained by rolling consists of a fibrous ferritic matrix and granular cementite and forms a stronger <101> fibrous texture. The comprehensive mechanical properties of the medium carbon steel bar prepared by the invention can achieve the property level of medium carbon steel treated by a conventional quenching and tempering process; the process is simple, the production efficiency is high, and the pollution caused by a quenching and tempering cooling medium to the environment is avoided; workpiece deformation, internal micro-crack initiation and cracking caused by quenching stress are uninvolved, and the product process properties and the mechanical properties are not affected by hardenability, temper brittleness and the like; alloy steel is not required to be selected for large-section workpieces, so that the material cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of processing method of ferrous materials.
Background technology
The prior heat treatment of medium carbon steel is modifier treatment, that is, high tempering after quenching, and obtains tempered sorbite tissue, the group
Knit and be made up of ferrite matrix and equally distributed spheroidite particle, so as to ensure to obtain good intensity, plasticity and tough
The cooperation of property, that is, obtain good comprehensive mechanical property.This traditional handicraft is mainly used in manufacture axle, pin, gear and connecting rod
Deng component of machine.Modifier treatment technique is related to quenching and high tempering, there is following deficiency：(1) quenching and high tempering are needed
Long-time heating and insulation are wanted, consuming the substantial amounts of energy, low production efficiency, and quenching and being tempered cooling medium used has to environment
Certain pollution.(2) uniform tempered sorbite tissue is obtained in order to ensure larger cross-section dimension workpiece, it is necessary to high using having
The addition price of quenching degree meet compared with the steel alloy of high alloy element great section workpiece through hardening layer depth require, material into
This height；For some steel alloys, also there is temper brittleness sensitiveness, it has to add Alloy Elements Mo costly.(3)
The Volumetric expansion that quenching process is produced with quick martensite transfor mation, causes larger quenching stress, exist workpiece deformation,
Internal tiny crack is germinated and tearing tendency.
The content of the invention
It is an object of the invention to provide a kind of not only can guarantee that medium carbon steel inside metallographic but also energy-conservation, the alternative tune of efficiency high
The medium carbon steel thermo-mechanical processi method of matter process.The technology path of the method for the invention is：By middle carbon quenched and tempered steel be heated to α+
γ two-phase sections, carry out multi- pass rolling deformation after insulation, be then air cooled to room temperature, obtain the ferrite with fibrous feature+
Spheroidite is organized.
The technical solution used in the present invention is specific as follows：
(1) medium carbon steel bar is heated into α+γ two-phase section temperature, 720～820 DEG C of temperature range, insulation in heating furnace
40min so as to obtain ferrite+austenitic duplex tissue；
(2) taking out rod iron carries out immediately 9 passage groove rollings, and total accumulative deformation amount controlling is rolled being not less than 70%
Heating furnace is put back to during system after every 3 passage and reheats 5min, then carry out next 3 passes, it is empty after the 9th passes
It is as cold as room temperature.Because rolling initial stage ferrite occurrence dynamics recrystallization, austenite is elongated and becomes threadiness, and makes crystal boundary and position
Mistake increases.The operation of rolling with bar cooling, when temperature is reduced to Ar1When, austenite occurrence dynamics perlitic transformation, while
The carbide of sheet can be crushed under rolling stress and effects of strain.In order to prevent the operation of rolling temperature drop from excessively causing rolling
Drag quickly increases, and takes and will roll after every 3 passage rod to put back in open rolling heating furnace to be incubated 5min, now due to crystal boundary and dislocation pair
The facilitation of carbon atom diffusion, makes cementite that fast spheroidizing annealing to occur, while partial austenitic transition process also can occur, so
Ensure to complete the follow-up operation of rolling under conditions of rolling drag is not significantly increased.Air cooling is obtained to room temperature after 9th passes
To the bacillar structure that ferrite and granular carbide are constituted, and have stronger<101>Fiber texture degree, makes substantial amounts of ferrite
{ 001 } cleavage surface parallel to rolling direction, this is not only improved there is crack deflection and carries perpendicular to rolling direction impact fracture
High impact toughness, is also beneficial to improve intensity and plasticity.
The physical metallurgy principle of the method for the invention is：Medium carbon steel makes iron in the initial passes deformation of two-phase section
Ferritic occurrence dynamics recrystallization softening, austenite deformation makes crystal grain elongate generation fibrillatable along rolling direction, causes austenite crystal
Boundary's quantity and dislocation density increase.In the operation of rolling, reduce with blank temperature, austenite can be transformed into the group of pearlite type
Knit, because number of grain boundaries and dislocation density are higher in deformed austenite, refine the cemetite lamellae in pearlite, and spacing subtracts
It is little.Jing melts down in short-term heating, then when carrying out rolling deformation, causes cemetite lamellae fragmentation, promotes cementite nodularization, while these ooze
Carbon body also suppresses ferritic crystal grain to grow up.So, when being cooled to room temperature, Fibrotic fining ferrite can be obtained and spherical is oozed
Carbon body is organized.
It is of the invention to have the advantage that compared with traditional modifier treatment：
1st, can be obtained in medium carbon steel and its modifier treatment identical tissue using this method, i.e. ferrite and spherical carburizing
Body is organized, and its tensile strength, yield strength, elongation percentage and impact flexibility are above the quenched place of GB/T 699-1999 medium carbon steel
Reason set quota.
2nd, preparation process is simple, production efficiency is high.
3rd, quenching and tempering heat treatment operation are not related to, it is to avoid the pollution that cooling medium is produced to environment, are not related to quench
The deformation of workpiece that fiery stress causes, internal tiny crack germinating and ftracture, Product Process performance and mechanical property by quenching degree and
Temper brittleness etc. affects.
4th, for great section workpiece, without the need for selecting steel alloy, the medium carbon steel processed using the present invention is entirely capable of meeting and is required,
Substantially reduce material cost.
Table 1 is listed and contrasted with the method for the invention and the medium carbon steel mechanical property of GB/T 699-1999 modifier treatment：
Table 1
Description of the drawings
Fig. 1 is the stereoscan photograph figure of the bar microscopic structure prepared by the embodiment of the present invention 1.
Fig. 2 is the stereoscan photograph figure of the bar microscopic structure prepared by the embodiment of the present invention 2.
Fig. 3 is the stereoscan photograph figure of the bar microscopic structure prepared by the embodiment of the present invention 3.
Fig. 4 is the stereoscan photograph figure of the bar microscopic structure prepared by the embodiment of the present invention 4.
Fig. 5 is the stereoscan photograph figure of the bar microscopic structure prepared by the embodiment of the present invention 5.
Fig. 6 is the stereoscan photograph figure of the bar microscopic structure prepared by the embodiment of the present invention 6.
Fig. 7 is the stereoscan photograph figure of the bar microscopic structure prepared by the embodiment of the present invention 7.
Specific embodiment
Technique of the present invention will be further illustrated according to specific embodiment and Figure of description below.
Embodiment 1
The steel pole of commercialization 45 of a diameter of 30mm is heated into 720 DEG C, 40min is incubated, coming out of the stove carries out accumulative deflection and be
70% 9 passage groove rollings (side-water chestnut-side), obtain the bar of square-section.Wherein the 9th passage be trimming, the 8th road
Rod iron is turned into 90 ° after secondary rolling and enters the 8th hole rolling again.3rd, after the 6th passes, rod iron is put back to respectively in 720 DEG C of stove
Insulation 5 minutes.9th passes terminate rear Direct Air-Cooled.
Embodiment 2～6
Scheme according to embodiment 1 is carried out, and is that heating-up temperature is changed into 740,760 from 720 DEG C with the difference of embodiment 1
DEG C, 780 DEG C, 800 DEG C and 820 DEG C, and the 3rd, the 6th passes terminate rear rod iron and melt down the temperature of heating correspondingly also by 720
DEG C it is changed into 740 DEG C, 760 DEG C, 780 DEG C, 800 DEG C and 820 DEG C.
Embodiment 7
Scheme according to embodiment 3 is carried out, and is that steel used are changed into 35 steel with the difference of embodiment 3.
Table 2 lists the mechanical property of the bar prepared by embodiment 1～7.
Table 2
Claims (2)
1. a kind of medium carbon steel thermo-mechanical processi method of alternative modifier treatment, it is characterised in that：
(1) medium carbon steel bar is heated into α+γ two-phase section temperature, 720～820 DEG C of temperature range, insulation in heating furnace
40min so as to obtain ferrite+austenitic duplex tissue；
(2) taking out rod iron carries out immediately 9 passage groove rollings, and total accumulative deformation amount controlling was rolled being not less than 70%
Heating furnace is put back in journey after every 3 passage and reheats 5min, then carry out next 3 passes, air cooling is arrived after the 9th passes
Room temperature.
2. the medium carbon steel thermo-mechanical processi method of alternative modifier treatment according to claim 1, it is characterised in that：Gained
To the bacillar structure that is made up of ferrite and granular carbide of medium carbon steel, and with stronger<101>Fiber texture degree.
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| CN201611094718.7A CN106636590B (en) | 2016-12-02 | 2016-12-02 | A kind of medium carbon steel thermo-mechanical processi method of alternative modifier treatment |
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| CN106636590B CN106636590B (en) | 2018-04-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109355549A (en) * | 2018-12-11 | 2019-02-19 | 东北大学 | A kind of steel plate and its manufacturing method with high intensity and excellent low temperature toughness |
| CN110055379A (en) * | 2019-06-03 | 2019-07-26 | 郑州航空工业管理学院 | A kind of preparation method of micro- multi-layer sheet structure steel plate |
| CN111485083A (en) * | 2019-01-25 | 2020-08-04 | 南京理工大学 | Preparation method of ultrahigh-strength nano heterogeneous low-carbon steel |
| CN113430359A (en) * | 2021-05-19 | 2021-09-24 | 西北工业大学 | High-strength and high-toughness rolling method for large-size gun steel bar |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109355549A (en) * | 2018-12-11 | 2019-02-19 | 东北大学 | A kind of steel plate and its manufacturing method with high intensity and excellent low temperature toughness |
| CN111485083A (en) * | 2019-01-25 | 2020-08-04 | 南京理工大学 | Preparation method of ultrahigh-strength nano heterogeneous low-carbon steel |
| CN111485083B (en) * | 2019-01-25 | 2021-09-10 | 南京理工大学 | Preparation method of ultrahigh-strength nano heterogeneous low-carbon steel |
| CN110055379A (en) * | 2019-06-03 | 2019-07-26 | 郑州航空工业管理学院 | A kind of preparation method of micro- multi-layer sheet structure steel plate |
| CN113430359A (en) * | 2021-05-19 | 2021-09-24 | 西北工业大学 | High-strength and high-toughness rolling method for large-size gun steel bar |
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| CN106636590B (en) | 2018-04-03 |
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